<template>
    <div>
        <!-- 面包屑区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示消息信息 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
            </el-alert>

            <!--  步骤条区域 -->
            <el-steps  :active="activeIndex - 0" finish-status="success" align-center >
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tabs标题栏 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="">
                            <!-- 级联选择器 -->
                            <el-cascader
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for = "item in manyTableDate" :key="item.attr_id">
                            <!-- checkbox 复选框 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" :key="i" v-for = "(cb,i) in item.attr_vals" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :key="item.attr_id" :label="item.attr_name" v-for="item in onlyTableDate">
                            <el-input v-model="item.attr_vals">
                            </el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- 上传的图片  list-type是图片列表的展示方式 -->
                        <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" :headers="headerObj" 
                        :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce" >
                        </quill-editor>
                        <el-button type="primary" class="btnAdd" @click="add">
                            添加商品
                        </el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 预览图片 -->
        <el-dialog
        title="预览图片"
        :visible.sync="previewVisible"
        width="50%"
        >
        <img :src="previewImg" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
//引入深拷贝包
import _ from 'lodash'

export default {
    data(){
        return {
            //当前步骤选中项
            activeIndex:"0",
            //添加商品表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属分类
                goods_cat:[],
                //添加商品图片数组
                pics:[],
                //添加商品  介绍
                goods_introduce:'',
                attrs:[]
            },
            //表单验证规则
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price:[
                     { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_weight:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_number:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ]

            },
            //商品分类数据
            cateList:[],
            //级联选择器验证规则
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger:'hover'
            },
            //动态参数  数据列表
            manyTableDate:[],
            //静态参数  数据列表
            onlyTableDate:[],
            //上传的后台地址 必须是绝对路径
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //上传图片携带的token
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            //预览图片弹出框  显示与隐藏
            previewVisible:false,
            //预览图片 
            previewImg:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            // console.log(res);
            if(res.meta.status !==200) return this.$message.error('获取分类数据失败！')
            
            this.cateList = res.data     
        },
        //级联选择器发生变化时 触发该事件
        handleChange(){
            console.log(this.addForm.goods_cat);
            //只能选择三级列表  否则数组清空
            if(this.addForm.goods_cat.length !== 3 ){
                this.addForm.goods_cat = []
            }
        },
        //tabs 标签页  钩子函数属性  再没有选择三级列表时禁止跳转其他页
        beforeTabLeave(activeName,oldActiveName){
            // console.log('进入前的名字是：' + activeName);
            // console.log('离开后的名字是：' + oldActiveName);
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请选择商品分类')
                return false
            }
        },
        //点击tabs 下面的任意 pane触发的事件
        async tabClicked(){
            //打印点击当前名称
            // console.log(this.activeIndex);
             if(this.activeIndex === "1"){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                // console.log(res);
                if(res.meta.status !== 200) return this.$message.error('获取商品参数失败！')
                // this.manyTableDate = res.data
                // console.log(this.manyTableDate);
                //循环数组 把每项下面的attr_vals字符串 以空格形式分割成数组
                res.data.forEach(item=>{
                   return item.attr_vals =  item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                // console.log(res.data);
                this.manyTableDate = res.data 
            }else if(this.activeIndex === "2"){
                 const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                 if(res.meta.status !== 200) return this.$message.error('获取商品属性失败！')
                 console.log(res.data);
                 this.onlyTableDate = res.data
            }
        },
        //处理图片预览效果
        handlePreview(file){
            console.log(file);
            //获取预览信息的绝对路径
            this.previewImg = file.response.data.url
            //弹出预览图片对话框
            this.previewVisible = true
        },
        //点击删除图片时的操作
        handleRemove(file){
            console.log(file);
            //获取移出图片信息路径
            const filePath = file.response.data.tmp_path
            // console.log(filePath);
            
            //找到对应的索引值
            const i = this.addForm.pics.findIndex(x=>
                x.pic === filePath
            )
            
            //通过索引值删除对应的数组项
            this.addForm.pics.splice(i,1)
            // console.log(this.addForm.pics);  
        },
        //上传图片成功后  钩子函数
        handleSuccess(response){
            //拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            //将图片信息对象,push到pics数组中
            this.addForm.pics.push(picInfo)
            // console.log(this.addForm.pics);
            
        },
        //添加商品
        async add(){
            
            //表单项预验证
            this.$refs.addFormRef.validate(valid=>{
                if(!valid) return this.$message.error('请输入完成的表单项')
            })
            //执行添加功能
            //要对addForm进行深拷贝  因为级联选择器需要的的是addForm.goods_cat为数组  而我们添加时需要携带的是以逗号分割的字符串 lodash  下的属性  cloneDeep
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // console.log(form);
            
            //处理动态参数 attrs
            
            this.manyTableDate.forEach(item=>{
                const newInfo = {
                    attr_id:item.attr_id,
                    attr_value:item.attr_vals.join(' ')
                }
                 this.addForm.attrs.push(newInfo)
            })
            
            //处理静态属性 attrs
            this.onlyTableDate.forEach(item=>{
                 const newInfo = {
                    attr_id:item.attr_id,
                    attr_value:item.attr_vals
                }
                 this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            // console.log(form);
            const {data:res} = await this.$http.post('goods',form)
            console.log(res);
            if(res.meta.status !== 201) return this.$message.error('添加商品失败！')
            this.$message.success('添加商品成功！')
            //跳转到商品列表
            this.$router.push('/goods')            
        }
    },
    //计算方法
    computed:{
        //当前分类id
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }else{
                return null
            }
        }
    }
}
</script>
<style lang="less" scoped>
    .el-checkbox{
        margin:0 10px 0 0!important;
    }
    .previewImg{
        width: 100%;
    }
    .btnAdd{
        margin-top:15px;
    }
</style>